[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-2711) PropertyAccessException with backref and <composite-map-key/>

PropertyAccessException with backref and <composite-map-key/> ------------------------------------------------------------- Key: HHH-2711 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2711 Project: Hibernate3 Issue Type: Bug Components: core Reporter: Steve Ebersole Assignee: Steve Ebersole Priority: Minor Fix For: 3.2.5, 3.3 Background ~~~~~~~~~~~ Whenever you map a one-to-many association unidirectionally from the many side, with the collection-key (FK) being defined as not-null, Hibernate creates a special property (PropertyAccessor) on the related entity which is used to determine the FK value. ~~~~~~~~~~~~~~~~~~~~ Currently, this causes problems in a few scenarios if that collection is a map and a <composite-map-key/> is used instead of a simple <map-key/>. The trivial workaround is to specify that the map keys be nullable. The fix is to have Hibernate either: 1) not attempt to access component sub-values from when the component instance == BrackrefPropertyAccessor.UNKNOWN; 2) have BrackrefPropertyAccessor be more aggressive in terms of trying to resolve the <composite-map-key/> in the first place. #1 is definitely the way to go in terms of performance. But it might mean needing to do that check in a few different places...